Java Script Error - Can't create service provider

I am having trouble with this plugin. When trying to add service providers, on saving it just comes up blank. I've now got a javascript error:

[Appointments+] You have at least one javascript error on http://fitnessacademy.me/wp-admin/network/plugins.php?activate=true&plugin_status=all&paged=1&s=.
Error message: Script error.
File:
Line: 0

Any assistance is appreciated.